gpu: Add traces for some gl calls that can be slow
gpu: Add traces for some gl calls that can be slow

BUG=none
TEST=about:gpu

Review URL: http://codereview.chromium.org/6897001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@82625 0039d316-1c4b-4281-b951-d872f2087c98

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